Fix link target.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208376 91177308-0d34-0410-b5e6-96231b3b80d8

www/comparison.html

@@ -108,7 +108,7 @@
         including support for a bytecode representation for intermediate code,
         pluggable optimizers, link-time optimization support, Just-In-Time
         compilation, ability to link in multiple code generators, etc.</li>
-    <li><a href="compatibility.html#c++">Clang's support for C++</a> is more
+    <li><a href="compatibility.html#cxx">Clang's support for C++</a> is more
         compliant than GCC's in many ways.</li>
     <li>Clang supports
         <a href="http://clang.llvm.org/docs/LanguageExtensions.html">many language